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HDPE stub flanges and backing rings are the best way for making adaptions, creating rotation points, and maximising ease of site working conditions. They are there the most popular method of connecting poly pipe to itself or to other materials. The polyethylene stub flange provides the sealing surface, the backing ring provides the strength required to seal the surfaces under pressure. Bolts are used to pull the stub flange and backing rings toward the sealing surface. The beauty of flange connections in poly, different from other materials, is that the pipe can be rotated for final adjustments before full tension is applied. This is extremely beneficial when valves are not 100% aligned or when there is a change in direction in the pipeline and the pipe is skew, rotating the flange face provides the ability to adjust, keeping things level, neat and without tension. Short spigot poly stubs are available off the shelf in both SDR17 and SDR11 in most sizes up to 900mm. Long spigot poly stubs are also available off the shelf in sizes up to 315mm diameter. If you require a special SDR rating, such as SDR13.6, SDR21 or SDR26, we offer machining services to provide the correct rating for your requirements.